Power cylinder



Jan. "7, 1936. N. A. CHRISTENSEN 2,026,672

POWER CYLINDER Filed Oct. 1, 1951 2 Sheets-Sheet 1 f Y Z /7 20 M ATT R 5w Jan. 7, 1936. N. CHR'ISTENSEN POWER CYLINDER 2 SheetsSheet 2 Filed Oct. 31, 1931 ATTO/n EV tutingan air tight chamber Patented Jan. 7, 1 936 UNITED STATES PATENT OFFICE POWER CYLINDER Niels A. Christensen, South Euclid, Ohio Application October 31, 1931, Serial No. 572,427

9 Claims.

This invention relates tonew and useful improvements in power cylinders in which force is transmitted by means of a pis the brakes of vehicles by manually.

ton therein to apply power instead of of damage to the closure plate occurs with closure plates when the bolts are tightened s such as frequently having radial lugs up against the lugs causing them to crack or break off Another important object of the invention resides in the provisionof fastening straps to take the place of the usual round b f closure plates to the ends of .which straps closely hug the cylinder and are Cele ' cylinder. h V desired, ma

H relatively wide to cover larg olts for securing the the power cylinder e parts of the. circumference of thecylinder and thereby protect the same from damage caused by flying missiles under the vehicle.

Another object of foricertain of the fastening automobile chassis.

the invention is to provide straps constituting 5 means for securing the power cylinder to the es of the invention will become apparent during the course of .=:the following description.

. In the accompanying drawings, forming a part 'of the descriptive matter an d' wherein like nuimerals are employed to designate" like parts throughout the several views Fig. 1 is a side elevation of a power'cylinder with the invention applied,

certain portions of the cylinder being broken awayzto illustrate the two different manners in which the closure plates are firmly clamped to the ends of the cylinders,

Fig. 2 is a fragmentarycend elevation ofthe same, A

' Fig. 3 cylinder and piston therein is a longitudinal section through the Fig. 4 is an end elevation of said cylinder show- I ing a modified arrangement of fastening ele- 'ments.

' Referring nowmore particularly to the drawings in detail, the numeral l aving one or both one or two end closure taining pressure or vacuum. closure plate for .b en il s r ted; it Q1 he in e t en e Fm? designates a power ends open. and; if

chined to form true: seats 2,'for the plates 3, thereby-consticapable of main- While a separate each end of the cylinder. has will be apparent that one end d integral the end with an annular bead or flange and only one closure plate employed for the single open end of the cylinder. Reciprocably mounted in the 0371-.- inder, is a piston having a piston rod'extending rearwardly of the cylinder to be suitably connected to the brake rigging not shown. The piston is composed of a pair of discs d'having clamped between their margins, a flexible piston cup I, having its angularly disposed circumferential margin pressed into snug engagement with the interior cylindrical walls-of cylinder II by .means of an expansible coil spring 8.v This spring is prevented from displacement by means ,of a plurality. of clips 9, secured to one end of the piston disc 6 and bent over the spring as clearly shown in Fig; 1. i Each and closure plate .3 is preferably cast with a circumferentially extending flange [0, forming an annular seat I l, for the reception of an end of the cylinder; This seat may be machined to make a snug end of the cylinder and if desired, a gasket may be ,,,positioned upon this seatto assure the desired A seal. The flange l0 isenla'rged axially. into a rounded bead as shown, to provide substantial surfaces for the fastening means to bepresently described. At suitably spaced intervals circumferentially of this flange are disposed comple- 1 mentary pairs of spaced shoulders I2, extending beyond the beaded surfaces of the flange to prevent accidental lateral shifting movement of the means for attaching the closure plates to the ends of thecylinder. H In order tosuitably strengthen each closure plate;3, reinforcing ribs l3 are cast on the exterior surface of the plate and converge from each pair of shoulders 12 to meet a radially extendingreinforcing rib I4. In this manner the converging reinforcing ribs provide depressions IS in the outer surface of the closure plate 3 at spaced intervals circumferentially thereof; such. depressions being disposed between and inwardly of the pairs of shoulders 12. c H

Each end plate is provided with antintegral elongated; bearing for a telescopic piston rod, one section 5a of which is fixed in the bearing on the left-hand end plate 3, while the other section 5b telescopes over this sleeve with an elongated graphite composition sleeve 39 disposed therebetween and extendingisubstantially the full length of thefirst section. The'outertelescopic section slides through an air tight bearing Si in the opposite end plate and a. second graphite composition sleeve 32. exteriorly'of which it is coupled with the coupling 50. After the piston assembly is in'serted into the cylinder, the two and it with the machined ated as at 22'to plates 3 are seated on the ends of the cylinder as illustrated with the pairs of shoulders l2 on the two end plates arranged in alignment and in complementary pairs as illustrated in Fig. 1.

A plurality of fastening elements in the form of metallic straps l6 and I1, are provided for securely attaching both end plates to the cylinder in tight relationship. These straps extend longitudinally of the cylinder I and are so arranged fat spaced iiitervals 'circumfe'rentially thereof to'b'e disposed between the complementary pairs of shoulders or lugs I2, on both end plates or upon one end plate and one end of the cylinder. These straps I6 and I! are arcuate in transverse section to closely hug and cover a large area'of the exterior surface of the cylinder. The straps H5 at the lower end of the cylinder each have one end thereof angularly disposed-and arcuat'ed to provide a hook l8 adapted to engage the'cire n re t a fla e i9 9? .enepifihe os plates feran;mea reng rmetyr er,*while thepppo- "S c F 0 .t bf t an .ij ffe c q it r d "stud l9, projecting b tween a of "the shoulders l2 and" a {slight 7 distance "beyond the closure plate fat the opposite end of the cylinder. A detachable metallic clip 2D havin'gfa degree of resilience "and ofj: substantially V-sh'ape, has one arm 2 thereoi perforated "to be received upon 'thestud'lta'n'd 1e freeend-of this arm is arcu- ,7 H gage around-thecircurnferential flange 10 ofthe cl: sure platejasillustrated. The 'other'armz'3 fo his clip, when-properly assojciated ""with the are -19 extends generally in a direction lon'gitudinad ly of the strap and isprd- Vicl'ed with an "offset "portion 24 its -free end 25 to engage the strap I 6 between itsends. A'lockwashe 26" nd aflnut {fare-positioned upon h :s d 9 a t-ligh r sd iv n em we e th h ed ..rt n..' eii lie fe ii into n 'engagementjwith "theflang eof :thef closure plate V employed for jclampi some of the studs [9" h adjacent one end of the" cylinder, while the studs end the "ieylinde r and ihovs thelatter firmly 'do'w 11 V upon tli'e' seat at the end of the "cylinder. I 'th s i an rib it iff seesaw ml andl, all of the straps l6, ng afclijsure 'plateupon the end of thefcylinder, are duplicates andare arranged to "extend inbpposite direct'ions, so that of the straps are located of the other strap "are arrange adjacent the opposite end of ;the" cylinder. "For instance, if six of the cylinder arefarrangedini' comparatively close relationshiflifor extensi onfthrgugh apertures "inthe chassis or 'suppqrtingjbrackets 28. 'Itwill be seen the present"illustratian that three-of the studs [9' at opposite"eridsfofthe' cylinder are extended through the "supporting brackets 28 landfi t e, are ete e ta l i;sli n d e be 'tured to avoid'interference with theflexible-bbot B and other parts extending from the ends of the cylinder.

As an alternative arrangement of straps, ones having duplicate ends may be employed in which event the straps l1, associated with the upper portion of the cylinder are identically the same construction as the straps IS with the exception that both ends thereof are reduced to form studs I9, corresponding to that formed on one end of each strap IB This arrangemen tflprovides both 10 endsof each str'ap I! with elongated threaded studs l9, adapted to receive clips 20 .at both ends thereof which engage the straps and the two closure plates in the same manner as described for tli'e'clip associated with the strap IS. The extended-studsm of straps l1, extend through thebrack ets 28, ior securely supporting the power cylindenatbbth ends. Lock nuts 29 are threaded upon'thegextended studs to clamp the mounting brackets 23 firmly against nuts 2'| abutting the :QlipsZU to the lilfgsffir abutm'ents n, it will "be obvious the straps cannot shift circumferejntially around thfe cylinder.

---indicated previously, the cylinder 1 may be formed with one end integral therewith "as shown in Fig lgsoas to dispensewith the necessity of {employing twotwsu're "pl'ates' 3. In such a modificationfthe closed end 'of tIie Cy-Iinder is provided with an axially extending bead er annularflange "l0, jeoiresp'onding to the "flange 1 formed on the "closure --plate 4 for the purpose 'of providing a' se'cu e footing f for "the hooks "l8 and clips at of the"straps. r r Y As indicated in the objects of 'the invention, the closure plates ofcylinders of this character heretofore used, have been formed with integral radially projecting aperture'd lugs forthe'rec'ep- "t'ion of the ends of the 'boltswhich'extend longitudi'nally "offthe'cylinder, but with such construction the lugsfarevery .apt'to become cracked. or bro'ke'n'ofi when the nuts on theen'dsofthe bolts are tightened severely. i'Il'i'egpresent construction obviates this "disadvantage, also *afiords considerable protection to the cylinder againstflyingmissilesfisince the straps l6 and a I! are comparatively wide and'closely'hug the exterior or -'the cylinder to cover a considerable areathereof.

It will be understood "thatvarious changes'in the sizejshap'e andarrangement-oftheparts may be resorted 'towithout"departing-from the spirit bf'the inventionor the scopewfthe-appended claims.

*1. The combination'witha cylinder and closure plate therefor; *of relatively wide "transversely "arc'uatedstraps extendingd-ongitudinally' of 'the cylinder conforming to the "curvature therebfand closely engaging the-same and-having fastening means at opposite ends engaging the c1osur e-p'late "and end of the'cylinder for 'c'lamping-tlie closure plate on the cylinder and for protecting theeylinder from damage.

' 2. The combination of a "cylinder having an open end, a closure plate having a flange resting upon "the end" ofsaid' cy1in'der,'-'arelatively "wide ftransversely curved fastening strap-extending the full l'ength*ofthe cylinder and lying fiatagainst the side thereofand naving niea is at-onend en- "gagr g'fan en'd of saidcylinderjand means'adjust-i "able' upon' 't-h e1 merit and engaging" the-flanged theclosureplatetofdetacliably hiount 'the closure vr ifli wind 3. The combinationfof {a cylinder having 'an "open end, a closure plate theiefor, a fastnihg fl;

elementextending longitudinally along the side of the cylinder and having a hook at one end engaging one end of said cylinder, and a resilient clip adjustably mounted upon said element and having a portion engaging the closure plate and another portion engaging the element between its ends for detachably mounting the closure plate upon the cylinder. 7 i

4. The combination of a cylinder having an open end, a closure plate having a flange resting upon the end of said cylinder, a fastening element extending longitudinally along the side of the cylinder and having a hook at one end engaging one end of said cylinder, and a substantially -shaped clip detachably mounted upon the other end of said element andhaving one arm provided with an arcuate end embracing the flange of the closure plate and its otherarm engaging said element between its ends.

'5. The combination of a cylinder having an open end, a closure plate therefor, a fastening element extending longitudinally of the cylinder and engaging one end of the cylinder, a clip adjustably mounted upon said element, and means for causing the clip to exert forces acting substantially at right angles, one acting upon the closure plate and the other force acting upon the body of the element.

6. The combination of a cylinder having open ends, closure plates having flanges resting upon the ends of the cylinder, a strap extending longitudinally of the cylinder and having one end provided with a hook adapted to embrace the flange of onenclosure plate, the other end of the strap terminating in a threaded shank, a substantially V-shaped clip having one arm provided with an aperture for reception upon said shank and terminating in a hook to engage over the flange of the other closure plate, the other arm or said clip engaging the strap between its ends, and a nut threaded upon said shank and engaging said clip to spring the same into binding engagement with the flange and strap.

'7. The combination of a cylinder having an 5 open end, a closure plate therefor, and a plurality of flat straps extending longitudinally for the full length of the cylinder for securing the closure plate thereto and lying flat against the sides of the cylinder to protect the same against damage, 10 each strap terminating at one end in an integral hook engaging one end of the cylinder, the other end of each strap terminating in an integral threaded shank, an anchor element through which said shank extends, and a nut on said 15 shank for forcing the anchor element against the other. end of the cylinder.

8. The combination of a cylinder having an open end, a closure plate therefor, resilient means engaging an end of the cylinder, fastening ele- 2Q ments extending the full length of the cylinder for fastening the closure thereon, each fastening element having an integral hook at one end engaging the closure plate, the other end of each element terminating in an integral threaded 5 shank extending through said resilient means, and nuts threaded on said shanks for forcing the resilient means against said cylinder.

9. A fastening element comprising an elongated flat strap having a hook formed at one end, 0 the other end of said strap formed into a threaded shank, a substantially V-shaped clip having an opening in one arm through which the shank extends, the other arm of the clip extending at substantially right angles and having a deflected 5 end adapted to engage a flat part of the strap, and a nut threaded on said shank to bear against said clip.

NIELS A. CHRISTENSEN. 

